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197 lines
4.1 KiB
197 lines
4.1 KiB
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/*++
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Copyright (c) 1991-1993 Microsoft Corporation
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Copyright 1994 MOTOROLA, INC. All Rights Reserved. This file
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contains copyrighted material. Use of this file is restricted
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by the provisions of a Motorola Software License Agreement.
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Module Name:
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psflshio.c
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Abstract:
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This module implements miscellaneous PowerPC HAL functions.
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Author:
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Jim Wooldridge ([email protected])
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Environment:
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Kernel mode
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Revision History:
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--*/
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#include "halp.h"
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#include "arccodes.h"
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//
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// Prototypes.
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//
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VOID
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HalpSweepPhysicalRangeInBothCaches(
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ULONG StartingPage,
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ULONG Offset,
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ULONG Length
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);
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VOID
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HalpSweepPhysicalIcacheRange(
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ULONG StartingPage,
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ULONG Offset,
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ULONG Length
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);
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ULONG
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HalGetDmaAlignmentRequirement (
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VOID
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)
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/*++
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Routine Description:
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This function returns the alignment requirements for DMA transfers on
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host system.
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Arguments:
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None.
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Return Value:
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The DMA alignment requirement is returned as the fucntion value.
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--*/
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{
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return 1;
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}
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VOID
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HalFlushIoBuffers (
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IN PMDL Mdl,
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IN BOOLEAN ReadOperation,
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IN BOOLEAN DmaOperation
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)
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/*++
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Routine Description:
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This function flushes the I/O buffer specified by the memory descriptor
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list from the data cache on the current processor.
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Arguments:
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Mdl - Supplies a pointer to a memory descriptor list that describes the
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I/O buffer location.
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ReadOperation - Supplies a boolean value that determines whether the I/O
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operation is a read into memory.
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DmaOperation - Supplies a boolean value that determines whether the I/O
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operation is a DMA operation.
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Return Value:
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None.
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--*/
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{
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ULONG Length;
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ULONG PartialLength;
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ULONG Offset;
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PULONG Page;
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BOOLEAN DoDcache = FALSE;
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Length = Mdl->ByteCount;
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if ( !Length ) {
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return;
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}
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//
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// If the I/O operation is not a DMA operation,
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// and the I/O operation is a page read operation,
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// then sweep (index/writeback/invalidate) the data cache.
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//
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if (((DmaOperation == FALSE) &&
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(ReadOperation != FALSE) &&
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((Mdl->MdlFlags & MDL_IO_PAGE_READ) != 0))) {
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DoDcache = TRUE;
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}
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//
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// If the I/O operation is a page read, then sweep (index/invalidate)
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// the range from the cache. Note it is not reasonable to sweep
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// the entire cache on an MP system as "Flash Invalidate" doesn't
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// broadcast the invalidate to other processors.
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//
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if ((ReadOperation != FALSE) &&
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((Mdl->MdlFlags & MDL_IO_PAGE_READ) != 0)) {
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Offset = Mdl->ByteOffset;
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PartialLength = PAGE_SIZE - Offset;
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if (PartialLength > Length) {
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PartialLength = Length;
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}
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Page = (PULONG)(Mdl + 1);
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if (DoDcache == TRUE) {
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HalpSweepPhysicalRangeInBothCaches(
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*Page++,
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Offset,
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PartialLength
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);
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Length -= PartialLength;
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if (Length) {
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PartialLength = PAGE_SIZE;
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do {
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if (PartialLength > Length) {
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PartialLength = Length;
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}
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HalpSweepPhysicalRangeInBothCaches(
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*Page++,
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0,
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PartialLength
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);
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Length -= PartialLength;
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} while (Length != 0);
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}
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} else {
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HalpSweepPhysicalIcacheRange(
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*Page++,
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Offset,
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PartialLength
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);
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Length -= PartialLength;
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if (Length) {
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PartialLength = PAGE_SIZE;
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do {
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if (PartialLength > Length) {
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PartialLength = Length;
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}
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HalpSweepPhysicalIcacheRange(
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*Page++,
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0,
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PartialLength
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);
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Length -= PartialLength;
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} while (Length != 0);
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}
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}
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}
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return;
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}
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